Delay Reverb Calculator

What Is a Delay and Reverb Calculator?

A delay and reverb calculator converts song tempo (BPM) into note durations in milliseconds. Audio producers use these values to sync delay and reverb effects with the beat so echoes fade cleanly between notes instead of clashing with the next hit.

Delay repeats the original sound at lower volume after a set time. Reverb simulates how sound reflects in a room. Both effects sound best when timed to the song's tempo.

How to Use This Calculator

1. Enter your song BPM. Use the tempo from your DAW, metronome, or tap tempo tool.
2. Review note durations. The table lists millisecond lengths for whole notes through sixty-fourth notes.
3. Set delay lengths. Pick a total delay note and a shorter pre-delay note to calculate decay time.

How Note Durations Are Calculated

The quarter note duration in milliseconds is:

$$\text{Quarter note (ms)} = \frac{60{,}000}{\text{BPM}}$$

Other note values are found by multiplying or dividing by two. A half note is twice the quarter note length. An eighth note is half the quarter note length. Dotted notes are 1.5 times their undotted value.

For pre-delay and decay, total delay equals pre-delay plus decay time. If you choose an eighth note (300 ms) as total delay and a sixty-fourth note (37.5 ms) as pre-delay, the decay time is 262.5 ms.

Why Sync Delay and Reverb to Tempo?

• Clarity: Echoes finish before the next note arrives.
• Groove: Rhythmic delays reinforce the beat instead of fighting it.
• Mix balance: Consistent timing makes reverbs feel natural in the track.
• Speed: Skip manual math and dial in values from the table instantly.

For related music tools, try our BPM Calculator, Chord Calculator, or Audio File Size Calculator.